lk | adds explanatory text to waiting list & disables mark_as_sold button for sold bikes, and removes unused columns

db/migrate/20160731014517_remove_entry_date_column_from_bikes.rb

@@ -0,0 +1,5 @@
+class RemoveEntryDateColumnFromBikes < ActiveRecord::Migration
+  def change
+    remove_column :bikes, :entry_date
+  end
+end